mainly on tax policy. >> reporter: vice president biden said romney would hike middle class taxes. >> how they can justify raising tax on the middle class has been buried the last four years. >> reporter: republicans jumped on that. buried by obama? >> vice president biden just today said that the middle class over the last four years has been, quote, buried. we agree. that mean we need to stop digging by electing mitt romney the next president of the united states. >> reporter: that's the kind of zinger sure to be heard tomorrow night. doug, andrew and chris say they hope to hear a lot of substance, too. at debate number one in their battleground ate. a lot is on the line. doreen talked about the nbc news "wall street journal" poll. 38%. more than a third of voters saying this debate and the three to follow, one vice presidential work the more presidential, will be important or extremely important to their decision about who to vote for. live from denver, i'm steve handelsman, news4. >> thank you. >>> a freelance american journalist who disappeared in syria eight weeks ago is now see